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Method for converting citrate soluble phosphate into water soluble phosphate

A technology of citron-soluble phosphorus and water-soluble phosphorus, applied in the field of phosphate fertilizers, can solve the problems of unfavorable citron-soluble phosphorus recycling, unfavorable application, low conversion rate, etc., to increase the scope of use and economic value, be conducive to recycling, improve The effect of conversion rate

Active Publication Date: 2016-12-14
辽宁营港锌硼酸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Citrate-soluble phosphorus refers to phosphorus that can be extracted by neutral ammonium citrate solution or c(EDTA)=0.2mol / L solution. Because it is slightly soluble in water, it is directly applied to the soil as a fertilizer, only a small part It can be directly used and absorbed by plants, so the utilization rate of phosphorus is extremely low, and the fertilizer has a slow effect, which is not conducive to its application in agriculture.
[0003] At present, 80% of domestic industrial phosphoric acid is prepared by wet-process phosphoric acid production process, and when using wet-process phosphoric acid to produce industrial-grade phosphate or fully water-soluble compound fertilizers, phosphoric acid needs to be purified, and more than 60% of phosphoric acid purification uses Ammonia neutralization and impurity removal process, which will produce a large amount of citrate-soluble phosphorus filter residue in the production process (citrate-soluble phosphorus in the filter residue accounts for 70-85% of the total phosphorus), which cannot be directly used for monoammonium phosphate because of its low water-soluble phosphorus Or ternary compound fertilizer production, so some domestic enterprises dry the filter residue and sell it as citrate-containing slag fertilizer; the other part is used as low-concentration compound fertilizer raw material, but the above two products are only suitable for acidic soil, if in other Phosphorus citrate used in soil cannot be directly absorbed by plants, resulting in a very low utilization rate of phosphorus
[0004] The conversion of citrate-soluble phosphorus into water-soluble phosphorus is a reversible reaction, and it is impossible to completely convert citrate-soluble phosphorus into water-soluble phosphorus. Therefore, improving the conversion rate of citrate-soluble phosphorus into water-soluble phosphorus is to increase the utilization rate and economic value of citrate-soluble phosphorus The most effective method, but in the prior art, due to the inappropriate method and the limitation of the process, the conversion rate of citrate-soluble phosphorus into water-soluble phosphorus is low, which is not conducive to the recycling of citrate-soluble phosphorus, the utilization rate of phosphorus is low, and the economic benefit is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. First, add 10kg of sulfuric acid and 20kg of nitric acid to the filter residue containing 100kg of citrate phosphate for mixing, then add 1.0kg of 5 parts of sodium dodecylbenzenesulfonate and 1 part of ammonium nitrate. The resulting activator was then activated at a temperature of 88°C for 2.0 hours to obtain a mixed slurry;

[0025] 2. Add 10 kg of yeast-derived organic raw materials to the mixed slurry obtained in step 1, and mix evenly to obtain a stable water-soluble phosphorus slurry.

[0026] The water-soluble slurry prepared above was tested experimentally.

Embodiment 2

[0028] 1. First add 10kg of sulfuric acid and 10kg of nitric acid to the filter residue containing 100kg of citrate phosphate for mixing, then add 2.0kg of 6 parts of sodium dodecylbenzenesulfonate and 1 part of ammonium nitrate. The resulting activator is then activated at a temperature of 85°C for 2.0 hours to obtain a mixed slurry;

[0029] 2. Add 5.0 kg of yeast-derived organic raw materials to the mixed slurry obtained in step 1, and mix evenly to obtain a stable water-soluble phosphorus slurry.

[0030] The water-soluble slurry prepared above was tested experimentally.

Embodiment 3

[0032] 1. First, add 10kg of sulfuric acid and 20kg of nitric acid to the solution containing 100kg of citrate phosphate for mixing, then add 0.5kg of 4 parts of sodium dodecylbenzenesulfonate and 1 part of ammonium nitrate. The resulting activator is then activated at a temperature of 90°C for 2.5 hours to obtain a mixed slurry;

[0033] 2. Add 20 kg of yeast-derived organic raw materials to the mixed slurry obtained in step 1, and mix evenly to obtain a stable water-soluble phosphorus slurry.

[0034] The water-soluble slurry prepared above was tested experimentally.

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Abstract

The invention discloses a method for converting citrate soluble phosphate into water soluble phosphate. According to the method, the effect of an activating agent is utilized, citrate soluble phosphate reacts with strong acid to generate unstable water soluble phosphate, and unstable water soluble phosphate is converted into stable water soluble phosphate under the effect of a stabilizer; therefore, the rate for converting citrate soluble phosphate into water soluble phosphate is increased, generated water soluble phosphate is wide in application range and high in economic value, and the use ratio of citrate soluble phosphate is significantly increased.

Description

technical field [0001] The invention relates to the field of phosphate fertilizers, in particular to a method for converting citrate-soluble phosphorus into water-soluble phosphorus. Background technique [0002] Citrate-soluble phosphorus refers to phosphorus that can be extracted by neutral ammonium citrate solution or c(EDTA)=0.2mol / L solution. Because it is slightly soluble in water, it is directly applied to the soil as a fertilizer, only a small part It can be directly used and absorbed by plants, so the utilization rate of phosphorus is extremely low, and the fertilizer has a slow effect, which is not conducive to its application in agriculture. [0003] At present, 80% of domestic industrial phosphoric acid is prepared by wet-process phosphoric acid production process, and when using wet-process phosphoric acid to produce industrial-grade phosphate or fully water-soluble compound fertilizers, phosphoric acid needs to be purified, and more than 60% of phosphoric acid ...

Claims

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Application Information

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IPC IPC(8): C01B25/26
CPCC01B25/26
Inventor 彭凌云尹家勇王运初周先花
Owner 辽宁营港锌硼酸科技开发有限公司
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